Abstract Using the IRAM interferometer we have detected
and
CO line emission toward the radio quiet quasar
PSS 2322+1944. At a redshift of
this is the
fourth and strongest detection of CO at
z>4. The
velocity-integrated CO
and
line
fluxes are
and
, and the linewidth is
. The
CO
was searched for but not detected with an
upper intensity limit of 30 mJy. The 1.35 mm (250
rest
wavelength) continuum flux density is
mJy, in agreement
with previous bolometer measurements at 1.2 mm with the 30-m IRAM
telescope. The 3 mm (580
rest wavelength) continuum is
not detected with a 3
upper limit of 0.7 mJy. We also
report observations of the 450
continuum in
PSS 2322+1944 using the SCUBA array at the JCMT. The quasar was
detected with a 450
flux density of
. At the angular resolution of
at
1.3 mm and
at 3.2 mm, the interferometer
observations do not show evidence of spatial extension in the
continuum or CO line emission. Assuming no gravitational
magnification, we estimate a molecular gas mass of
. The molecular gas is
warm (
) and dense (
).
The infrared-to-CO luminosity ratio is
, comparable to the values found
for ultraluminous infrared galaxies. The detection of CO emission
in this high redshift QSO provides further evidence that the radio
emission and the millimeter to submillimeter continuum emission are
predominantly powered by a starburst which is coeval with the AGN
activity.